Genetic Enhancement Of Leaf Rust Resistance In Bread  Wheat (Triticum Aestivum L.) Through Marker-Assisted  Introgression Of Lr24 And Lr28

Deepak Koujalagi; S A Desai; Suma Biradar; B S Savitha; K J YashvanthaKumar; Rudra Naik; T N Satish

doi:10.48165/

Authors

Deepak Koujalagi Department of Genetics and Plant Breeding, College of Agriculture, G.B. Pant University of Agriculture & Technology, Pantnagar - 263 145, Uttarakhand (India)
S A Desai Protection of Plant Varieties and Farmer’s Rights Authority, New Delhi - 110 012 (India)
Suma Biradar epartment of Genetics and Plant Breeding, University of Agricultural Sciences (UAS), Dharwad - 580 005, Karnataka (India)
B S Savitha epartment of Genetics and Plant Breeding, University of Agricultural Sciences (UAS), Dharwad - 580 005, Karnataka (India)
K J YashvanthaKumar Agharkar Research Institute, Pune - 411 004, Maharashtra (India)
Rudra Naik Department of Genetics and Plant Breeding, University of Agricultural Sciences (UAS), Dharwad - 580 005, Karnataka (India)
T N Satish Department of Genetics and Plant Breeding, University of Agricultural & Horticultural Sciences, Shivamoga - 577 216, Karnataka (India)

DOI:

https://doi.org/10.48165/

Keywords:

Coefficient of incidence, marker-assisted introgression, rust resistance, SCAR marker

Abstract

The present study was initiated with the objective of marker-assisted introgression of Lr24 and Lr28, wheat leaf rust resistance genes, into an elite susceptible bread wheat genotype MP3299 from NIL-PBW 343. Marker assisted selection alongwith screening of genotypes under epiphytotic conditions was undertaken in this study. SCAR molecular markers SCS73719 and SCS421570 linked to Lr24 and Lr28, respectively, confirmed in segregating population of MP3299 x NIL-PBW 343, were further evaluated for leaf rust resistance under artificial leaf rust condition. In F4 and F5 populations, high degree of leaf rust resistance was observed in plants carrying both Lr24 and Lr28 genes as compared to the plants with individual leaf rust resistance gene Lr24, followed by Lr28. Significant correlation and regression were observed between most of the agronomic traits and coefficient of incidence. Six Lr28 homozygous plants identified with high degree of leaf rust resistance were advanced for yield trials. The identified lines seem potential resistance sources and superior recombinants for future breeding programmes.

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